A quote by Jonathan Zdziarski on an Ars Technica article about the
long-running Apple location cache.

It’s part of the Core Location cache on the phone. So, it’s not a covert,
evil, Big Brother secret invisible file, but Apple has been administratively
lazy in their programming, which is the root cause of most data leaks on the
iPhone.

The two hardest problems in computer science: cache invalidation, and not
pissing off your users.